<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<script type="text/javascript">
  console.log(3)
  
  var arr = [1, 3]
  for (var i = 0; i < arr.length; i++) {
    var item = arr[i]
  }

  var fn = function test () {

  }
</script>
</body>
</html>